I'm a little late to the party, but I will address the OP...
In my humble experience, negative opinions are frowned upon in these forums, and in some cases, even a simple question can result in the most misplaced nerd-rage that it's unbelievable. Particularly if it involves the upcoming, soon to be released Civ game. Speculation is ridiculed, discussion is quashed, and any sort of dissenting opinion is met with harsh rhetoric.
I can recall the weeks leading up to the release of Civ 5. The rancor and vitriol was at a level that most of us had never seen on these forums before. Asking a question, making an even slightly negative comment, or theorizing a possible modding scenario, would get you your head served on a platter. I'm not the only one. From earlier in this thread:
When you just wanted to know something about Civ5 or share possible future changes it should undergo, etc., your thread would be drown in vitriol and rage. It basically made every forum for the game entirely unfit for purpose because it was a repetitive, endless cycle of rage and moaning. I think that's why people aren't always open to negative opinions near the release of a Civ title.
A few of us, during the release phase of Civ 5, speculated that a large group of 12 to 15 year olds had suddenly commandeered mummy's laptop and had discovered the forums here at CFC. Posters certainly weren't acting like the (mostly) adults that we knew from the Civ 4 forums. They were acting like a group of badly behaved children. In some cases, that is still true today. The pre-launch of Civ 6 saw some "interesting" discussion, though the mods kept a better handle on things than they did during the launch of Civ 5, so it didn't get too out of hand. It was still depressing to watch.
I've been lurking on the Civ 6 forums to find out more about the game. If it's any good, what are the state of the patches, etc. I still see some of the same bullies that I saw during the Civ 5 launch. Some are old, some are new, and some have different names, but they are all the same and interchangeable. They exist to shut down discussion if you don't agree with their point of view. If you don't toe the line you get attacked. Plain and simple.
So, my dear OP, you are right. There is no room for negative comments on these forums anymore. That seems to have gone out the window a few years ago. You can take solace in one thing though. Some of those very people who were bullying people and browbeating them for having a question or negative opinion before the launch of Civ 6, are now themselves criticizing the game. The best part is that most of them have now left the forums, hopefully not to return. But it's like that in all the forums I belong to.
I leave you with one thought: Say what you have to say, and to hell with the opinions of someone else. There are good people out there who will listen. And there are better games out there, too.